We use the 5.0 living rulebook. The exact wording for the event is the following:
Throw a Rock: An enraged fan hurls a large rock at one of the players on the opposing team. Each coach rolls a D6 and adds their FAME (see page 18) to the roll. The fans of the team that rolls higher are the ones that threw the rock. In the case of a tie a rock is thrown at each team! Decide randomly which player in the other team was hit (only players on the pitch are eligible) and roll for the effects of the injury straight away. No Armour roll is required.
I was under the impression this meant I had to roll on the injury table first, with the possibility to get a casualty table follow-up, for two reasons:
The rule clearly states the armour role should be skipped, but does not mention the same for the injury roll.
It is clear that there should be a roll, even in a one-off (no campaign or tournament) match. Those matches don't use the casualty table.
My opponent was under the impression I needed to roll casualty straight away, because the rule states to roll for injury effect, not for injury. The only spectator agreed, so I agreed to do it that way, but I would like to know if that was correct.